Ascarids Flashcards
Which species of Ascarids is called “non-migrating”
Toxascaris leonina
Which species of Ascarids affects dogs?
Toxocara canis
What species of Ascarids affects cats?
Toxocara cati
The ascarid species Baylisascaris procyonis affects…
Raccoons and dogs
Describe the morphology of T. canis
Thin, rounded cervical alae
Describe the morphology of T. cati
Broad, rounded cervical alae
Describe the morphology of T. leonina
Triangular shaped cervical alae
Where are adult ascarids located in the human body
Small intestine
Where are the lips located on ascarids?
Anterior end
What is the length of an adult female T. canis
5 inches
What is the length of an adult female T. cati?
3 inches
What is the length of an adult female T. leonina
2.5 inches
Describe the ova for T. canis
Round, rough exterior, thick-shelled, unicellular, dark interior
Describe the ova for T. cati
Same as T. canis but smaller
Describe the ova of T. leonina
Oval-shaped, smooth shell, unicellular, light on the inside
Are ascarids attached in the GIT?
NO
How long does it take for T. canis to become infective?
4 weeks
What is the prepatent period for T. canis?
4 weeks
How long does it take T. cati to become infective
4 weeks
What is the pre-patent period for T. cati
8 weeks
How long does it take for T. leonina to become infective
1 week
What is the pre-patent period for T. leonina
8-10 weeks
Describe the 4 stages of ascarid development in the pre-parasitic stage
1) unicellular egg
2) L1 larvae develops in egg
3) molts to L2 larvae in egg
4) Molt to L3 in egg
Describe the 4 stages of ascarid development in the parasitic stages
1) L3 egg is ingested and hatches
2) Molts to L4
3) Molts to L5
4) Matures into adult males and females
Can ascarid infection be transplacental in puppies?
Yes
What are the organs affected and clinical signs of ascarid migrating larva infections in puppies?
Liver and no clinical signs
What are the organs affected and clinical signs of ascarid adult worm infections in puppies?
1) Lung- coughing, dyspnea, and sudden death
2) Stomach- vomiting
3) Small intestines- mucoid diarrhea
4) General Body- Pot bellied, crying, rough coat, lack of weight gain, obstructive jaundice
What are the organs affected and clinical signs of ascarid aberrant larvae in puppies?
1) CNS- meningitis like signs
How do you diagnose an ascarid infection?
Fecal flotation
What drugs are used to treat ascarid infections?
1) Pyrantel pamoate
2) Panacur
What two infections in humans can T. canis cause?
Visceral Migrans Larvae & Ocular Migrans Larvae
Which species does T. leonina affect?
Dogs, cats & wild canids/felines
